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Search Results: 1 - 10 of 7601 matches for " Muhammad Arif "
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On Certain Sufficiency Criteria for -Valent Meromorphic Spiralike Functions
Muhammad Arif
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/837913
Abstract: We consider some subclasses of meromorphic multivalent functions and obtain certain simple sufficiency criteria for the functions belonging to these classes. We also study the mapping properties of these classes under an integral operator.
Sufficiency Criteria for a Class of -Valent Analytic Functions of Complex Order
Muhammad Arif
Abstract and Applied Analysis , 2013, DOI: 10.1155/2013/517296
Design of Grid-Connected Photovoltaic System  [PDF]
Naseer Khan, Muhammad Aamir, Faisal Mehmood, Muhammad Aslam, Muhammad Arif
Journal of Power and Energy Engineering (JPEE) , 2017, DOI: 10.4236/jpee.2017.58001
Abstract: This paper presents a grid connected photovoltaic system (PV) with a proposed high voltage conversion ratio DC-DC converter which steps up the variable low input voltages of photovoltaic module to the required DC link voltage. This voltage is applied to an H-bridge inverter which converts DC voltage into AC voltage and a low pass filter is used to filter the output. By adjusting the duty ratio of switches in DC-DC converter, the magnitude of inverter’s output voltage is controlled. The frequency and phase synchronization are ensured by a feedback signal taken from the grid. In this way, inverter is synchronized and connected with the grid to meet the energy demand. The PV system has been designed and simulated.
Controls and Implications of Geo-Technical Variation in Quartzose Rocks from Peshawar Basin, North-Western Pakistan  [PDF]
Khanzada Wazir, Mohammad Arif, Muhammad Sajid
Geomaterials (GM) , 2015, DOI: 10.4236/gm.2015.54009
Abstract: Petrographic and geo-mechanical properties of samples representing quartzose rocks of Tanawal Formation (Baja Bamkhel area, Swabi) and Misri Banda quartzite (Nowshera) from Peshawar Basin, NW Pakistan, have been investigated. Although formerly referred to as quartzite, mineralogical composition and textural details support characterization of the studied quartzose samples of Tanawal Formation as blasto-psammite and those of Misri Banda as sub-arkose. The two rock types also show significant differences in terms of matrix and heavy mineral concentrations as well as the degree and frequency of intra-granular deformation. On the basis of unconfined compressive strength (UCS), both fall in the category of very strong rocks. Correspondingly, their specific gravity and water absorption values are high and low respectively and lie well within the range permissible for use as construction material. However, both contain high amounts of deleterious components, i.e. reactive forms of silica (chert and/or strained quartz) and clay minerals. Therefore, they cannot be used as coarse aggregate with Ordinary Portland Cement (OPC) and asphalt. The modal abundance of quartz is higher in the Misri Banda than the Tanawal samples, but the quartz to feldspar ratios are higher for the latter. Yet, the sub-arkosic Misri Banda rocks are stronger than the Tanawal blasto-psammites, most probably because they are i) almost totally devoid of matrix; ii) finer grained; iii) having a higher percentage of grains with irregular and sutured contacts and iv) lesser abundance of grains displaying intra-granular deformation.
Mapping Properties of Generalized Robertson Functions under Certain Integral Operators  [PDF]
Muhammad Arif, Wasim Ul-Haq, Muhammad Ismail
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.31009
Abstract: In the present article, certain classes of generalized p-valent Robertson functions are considered. Mapping properties of these classes are investigated under certain p-valent integral operators introduced by Frasin recently.
Globalization and paradigm changes in Teacher Education: Revolutionizing Teaching Learning Process at School Level in Pakistan
Muhammad Iqbal,Muhammad Irfan Arif
International Education Studies , 2011, DOI: 10.5539/ies.v4n4p99
Abstract: The world has become a global village. No county can live in isolation without seeking impact of global trends and a change in all field of life education is the most important tool in national development. So this age of knowledge has great impact on education. Teacher education is the brain of all educational disciplines as it delivers education to train the prospective teachers. It is also the mother of all professions. Like all other professions, globalization is also affecting teacher education. Therefore there is a global paradigm shift in teacher education. The main purpose of this study was to explore the paradigm shift in teacher education which has revolutionized teaching learning process at school level. The teacher education programs of five public universities of Pakistan where focused to fulfill the objectives of the study. The study was quantitative as well as qualitative in nature. Information regarding shift paradigm in teacher education were gathered by conducting self administered surveys, document analysis and interviews. Sample of the study comprised of prospective teachers, working teachers and executives (directors and heads).total 100 prospective teahers, 50 working teachers and 20 executives were selected by using random sampling techniques, collected data was analyzed by implementing simple descriptive statistical techniques such as percentages. The main paradigm changes in teacher education in perception of the selected respondents were: increase in duration of teacher education programmes, standard based curriculum, balance in theory and practice, shift from teacher to student centered delivery system, quality assurance and shift in assessment procedures.
The thermoanalytical, infrared and pyrolysis-gas chromatography-mass spectrometric sifting of poly (methyl methacrylate) in the presence of phosphorus tribromide  [PDF]
Muhammad Arshad, Khalid Masud, Muhammad Arif, Saeed-ur Rehman, Jamshed H. Zaidi, Muhammad Arif, Aamer Saeed, Tariq Yasin
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.24039
Abstract: The behaviour of poly(methyl methacrylate) was examined in the presence of phosphorus tri-bromide (PBr3) with varying concentrations. Films were cast from common solvent and subjected to TG, DTA, DTG, IR and Py-GC-MS for evaluating the degradation routes. Despite early decomposition of the blends, certain tempera-ture zones were identified for stabilization of the system. New products were found and mecha-nisms of their formation were proposed. Pyro-lysis of the blends was also carried out at dif-ferent temperatures to ascertain the nature of interaction between the constituents of the system.
Muhammad Arif Maan
The Professional Medical Journal , 2000,
Abstract: DESIGN: Epidemiological study. SETTING: DHQ & Allied Hospitals department of dermatology PunjabMedical College, Faisalabad. PERIOD: 20-06-1993 to 19-05-1994. PATIENTS AND METHODS: Total30 patients were involved. RESULTS AND CONCLUSION: Male patients were 19(63.3%) and 11(36.7%)were female. Age of onset varied from 8-80 years, maximum patients were in age group 20-30 years. Twentysix patients (86.7%) were of pemphigus vulgaris, 3(10%) pemphigus foliaceous and 1(3.3%) pemphiguserythematosus. All patients belonged to low socio-economic group of the society, rural 17(56.7%) and13(43.3%) urban. Duration of disease before presentation varied from 4 weeks to 7 years with mean durationof 1.5 years. Younger patients were diagnosed with high incidence in males and low socio-economic group.
Coefficient Inequalities of Analytic Functions Related to Robertson Functions
Muhammad Arif,Mumtaz Ali
Journal of Mathematics , 2013, DOI: 10.1155/2013/630934
Abstract: We introduce and study a subclass of analytic functions related to Robertson functions. Here we discuss the coefficient estimate for function in this class. 1. Introduction Let be the class of functions of the form which are analytic in the open unit disc . Also let and denote the well-known classes of starlike and convex functions, respectively. For any two analytic functions given by (1) and with the convolution (Hadamard product) is given by Using the concept of convolution, Ruscheweyh [1] introduced a differential operator given by with where is a Pochhammer symbol given as It is obvious that , , and The following identity can easily be established: Now with the help of Ruscheweyh derivative, we define a class of analytic functions as follows. Definition 1. Let . Then, , if and only if where , , , is real with , and . By giving specific values to , , , , and in , we obtain many important subclasses studied by various authors in earlier papers, see for details [2–5], and list some of them as follows: (i) and , studied by Spacek [6] and Robertson [7], respectively; for the advancement work, see [8, 9].(ii) and , studied by both Owa et al. and Shams et al. [10, 11].(iii) , , introduced by Ravichandran et al. [12]. (iv) , considered by Latha [13].(v) , , the well-known classes of starlike and convex functions of order . From the above special cases, we note that this class provides a continuous passage from the class of starlike functions to the class of convex functions. We will assume throughout our discussion, unless otherwise stated, that , , , is real with , and . 2. Some Properties of the Class Theorem 2. If with , then Proof. Since for any complex number , implies that which implies that And hence, we obtain the required result. Put , , and in Theorem 2; we obtain the following result. Corollary 3 (see [10]). If with , then Set , , and in Theorem 2; one has the following result. Corollary 4 (see [10]). If with , then Theorem 5. If , then where Proof. We note that for , Let us define the function by Then, is analytic in with and . Let Then, (19) can be written as and using (8), we have which implies that where we have used (4) and (5). Now applying the coefficient estimates for Caratheodory function [14], we obtain For , which proves (15). For , Therefore, (16) holds for . Assume that (16) is true for all and consider Thus, the result is true for , and hence by induction, (16) holds for all . If we set , , and in Theorem 5, we get the result proved in [10]. Corollary 6. If , then Remark 7. If we take in Corollary 6, we have which was proved by
A Cross Entropy-Genetic Algorithm for m-Machines No-Wait Job-ShopScheduling Problem  [PDF]
Budi Santosa, Muhammad Arif Budiman, Stefanus Eko Wiratno
Journal of Intelligent Learning Systems and Applications (JILSA) , 2011, DOI: 10.4236/jilsa.2011.33018
Abstract: No-wait job-shop scheduling (NWJSS) problem is one of the classical scheduling problems that exist on many kinds of industry with no-wait constraint, such as metal working, plastic, chemical, and food industries. Several methods have been proposed to solve this problem, both exact (i.e. integer programming) and metaheuristic methods. Cross entropy (CE), as a new metaheuristic, can be an alternative method to solve NWJSS problem. This method has been used in combinatorial optimization, as well as multi-external optimization and rare-event simulation. On these problems, CE implementation results an optimal value with less computational time in average. However, using original CE to solve large scale NWJSS requires high computational time. Considering this shortcoming, this paper proposed a hybrid of cross entropy with genetic algorithm (GA), called CEGA, on m-machines NWJSS. The results are compared with other metaheuritics: Genetic Algorithm-Simulated Annealing (GASA) and hybrid tabu search. The results showed that CEGA providing better or at least equal makespans in comparison with the other two methods.
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